Carl wilhelm vollmann



Z avwemto'a Patented Apr. l8, I899.

B. W. VOLLMANN.

VALVE.

(Application filed Apr. 11, 1898.)

s PETERS co. Pwam-umowwwmc-mu. u. c.

No. 623,l94.

(No Model.)

with STATES PATENT Orrrcn.

CARL XVILHELM VOLLMANN, OF MONTREAL, CANADA.

VALVE.

SPECIFICATION forming part of Letters Patent No. 623,194., dated April18, 1899.

Application filed April 11, 1898.

To whom it may concern:

Be it known that I, CARL WILHELM VoLL- MANN, of the city of Montreal,Province .of Quebec, Canada, have invented certain new and usefulImprovements in Valves; and I do hereby declare that the following is afull, clear, and exact description of the same.

My invention, although applicable for the control of fluids or gasesgenerally, is particularly applicable for the control of impure gases orliquids, and has for its object to en.- able the more perfect closing ofa port to be attained and at the same time to remove any foreignsubstance that may adhere to the valve-seat. v

The invention consists, broadly speaking, in adapting a valve to slideacross its seat and be held yieldingly in contact with either a portionor the whole thereof until it is in closing position, at which time itis forced by unyielding means into perfectly tight contact therewith.

More specifically speaking, the valve consists of two sections connectedat one end to a traveling block and adapted to travel with the block ina chamber intersecting the passage for the gas or fluid, as the case maybe. Yielding resistances, preferably in the form of a pair of coiledsprings, bear between said sections and cause them to normallyyieldinglybear upon the valve-seats formed by the ends protruding intosaid chamber of the pipe forming the said passage. Projecting upwardlyfrom the lower end of the chamber to a point near the top of the passageis awedgelike device, with the inclined sides of which the sections ofthe valve, which are also wedgelike in form, come in contact as they arein the act of completing the closure of the passage, and as they areforced farther toward the bottom of the chambers will be jammed againstsaid valve-seats, the lower edges of the valve-sections being formedwith knifeedges to scrape the faces of said valve-seats and remove anyforeign substance that may adhere thereto.

The means for actuating the valve consists, preferably, of a screwheldagainst longitudinal movement, but free to rotate at its lower end in arecess in the upper end of the wedgelike projection and at its upper endin a cap Serial No. 677,226. (No model) forming the upper end of thechamber, the before mentioned traveling block having a screw-threadedperforation therethro ugh and taking over and traveling along said screwas the screw is rotated, which can be done by any preferred means.

For full comprehension, however, of thein vention reference must behadto the accom panying drawings, forming a part of this specification, inwhich like symbols indicate corresponding parts, and wherein- Figure lis a longitudinal vertical sectional view of a valve constructedaccording to my invention; Fig. 2, a transverse vertical sectional viewthereof; Fig. 3, a part plan and part sectional view taken on line 3 3,Fig. 1; andFig. 4 a horizontal sectional view taken on line 4 4, Fig. 2.

The valve-casing is preferably formed with a horizontal passage 5,having midway of its length an enlargement 6, with open top providedwith a lateral flange 7, grooved as at 8.

A dome 9, havingits lower open end flanged,

The enlargement 6 and dome 9 constitute the valve-chamber, into whichthe ends of the pipe-like portion of the casing project and formvalve-seats 16 17. The bottom or floor of this chamber has a recess 18,in which is located the lower diminished end 19 of a wedge-likeprojection 20, having its upper end recessed,as at 21, to receive thelower diminished end of the before-mentioned screw 15, which is formedwith a rigid flange or collar 22 to bear upon the interior of the top ofthe dome and retain the screw 15 against longitudinal movement. Thewedge 20 is retainedin place simply by its diminished end 9 resting inthe recess 18 and the connection of its upper end with the lower end ofthe the respective valve-seats 16 and 17. These .valve-sections havetheir lower portions formed with tapered recesses to take over thewedge-like projection 20,while their lower edges are formed withknife-edges 2G and their upper adjacent parallel faces recessed, as at27, to take over a traveling block 28, having a screw-threadedperforation 29. to take upon and travel along the screw 15, these valvesections being maintained in yielding contact with the valve-seats bymeans of coiled springs 30, having their ends located in recesses formedin the adjacent faces of the lower parallel portions thereof.

By the rotation of the screw which may be effected by any preferredmeans, the valvesections will through the block 28 be either raisedorlowered in the chamber. While they are in their raised position andgas or fluid is flowing through the port, a quantity of grit or otherforeign substance frequently gathers upon the valve-seats. Such isparticularly the case when impure gases or liquids are controlled.Thisis scraped 06 by the knife-edges 26 during the lowering of thevalve-sections, the springs 30 facilitating such action, while the wedge20 acts upon the sections as they are completing the closure of theports and forces them into perfectly-tight contact with theirvalve-seats.

\Vhat I claim is as follows:

1. In combination with a sliding valve and valve-seat the valve havingits lower edge formed with a knife-edge, of stationary means formaintaining said valve always in yielding contact with its seat andunyielding means independent of said valve and adapted to act upon sameat the completion of its closing movement and force same into contactwith its seat and means for operating said valve, for the purpose setforth.

2. The combination of a valve-casing having achamber extending at rightangles to and intersecting the passage therethrough, a valve formed intwo sections located respectively adjacent to the ends formed by the in:

tersection of said passage, a wedge-like pro-,

jection carried by the floor or bottom of said chamber and locatedintermediate of said valve-sections, the lower edges of saidvalvesections being formed-with knife-edges, and a yielding resistanceadapted to maintain said valve-sections yieldingly in contact with theirvalve-seats, substantially as and for the purpose set forth.

3. The combination with a valve-casing of a sliding valve having aknife-edge and a spring tending to force said edge against thevalve-seats in traveling over same to keep 'such seats clear of foreignsubstances, as set CARL \VILHELM VOLLMANN.

NVitnesses:

WILLIAM P. McFEAr, FRED. J. SEARS.

